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Sequoia 680 Chesapeake Drrve Redwood Crry CA 94063 (650) 364-9600 FAX(650) 364-9233 <br /> A 404 N Wigee lane Walnur Creek CA 94598 (925)988 9600 FAX(925)988 9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)9Z1 9600 FAX(916)921 0100 <br /> Analytical 1455 McDowell 81vd North Ste D Petaluma,CA 94954 (707) 792 1865 FAX(707)792 0342 <br /> EA Engineering Science &Tech Client Prol ID Exxon 7-3942, 5153942 1300 Sampled 08/19/98 <br /> Mt Diablo Blvd Ste 8100 Sample Descript V2 Received 08/20/98 <br /> 134611 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 08/31/98 <br /> Attention Chnsta Marting Lab Number 9808C98-19 Reported 09J04J98 <br /> IC Batch Number GCO83198BTEX02A <br /> Istrument ID GCHP02 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX and MTBE <br /> Analyte Detection Limit Sample Results <br /> ug/L ug/L <br /> jTPPH as Gas 10000 46000 <br /> Methyl t-Butyl Ether 500 N D <br /> Benzene 100 <br /> Toluene 3300 <br /> 100 16000 <br /> lEthyl Benzene 100 16000 <br /> Xylenes (Total) 100 7900 <br /> Chromatogram Pattern GAS <br /> lSurrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 111 <br /> I � <br /> r <br /> 1 , <br /> r <br /> L <br /> r <br /> t <br /> r <br /> I <br /> t <br /> tlytes reported as N D were not present above the stated limit of detection E <br /> t--QUOIA ANALYTICAL - ELAP #1210 <br /> erlrng <br /> Alkanager Page 2 <br /> t <br />